Engineering Marvel of the Winter Olympics: A Broom (nytimes.com)

Andrew Flemming and Geoff Fowler, both 29, along with their friend and business partner, Will Hamilton, 37, were pouring their creative energies into a high-tech training device the likes of which the sporting world had never seen. They were building a better broom. From a report: Not just any broom, but one that they thought could be essential to the sport of curling, which relies on the best broom handling out there as teams strategically cajole a polished granite rock across a sheet of ice. They wound up calling it the SmartBroom, and in a sport that can come across as vaguely primordial, their piece of 21st-century gadgetry could play a role in determining who wins gold at the 2018 Winter Olympics in Pyeongchang, South Korea.

Each SmartBroom has four sensors in the broom head that relay data to a small display unit. Hamilton took one for a spin down the ice, and the data was instantaneous — line graphs along with a slew of numbers that showed his force in pounds and his stroke rate in hertz. Hamilton also pointed to a figure that he described as his “sweeping performance index,” or S.P.I., a metric that combines power and speed in one easy-to-digest figure. Patrick Janssen, a world-class curler from Canada, has consistently registered an S.P.I. in the 2,800 range. The numbers by themselves might not mean much, Flemming said, but subtle changes in technique can lead to big differences in the quality of each stroke. And now curlers have that information at their disposal. They can experiment to see which stroke works best for them.